Evolution and development of polyacid-modified adhesives for lased dentin

激光牙本质多元酸改性粘合剂的演变和发展

• 批准号: 10557178
• 负责人: FUJITANI Morioki
• 金额: $ 8.58万
• 依托单位: HIROSIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10557178/
• 关键词: Er : YAG Laser; CO2 Laser; Adhesive resin; Dentin Bonding; Mechanism of Adhesion; Interface of Adhesion; Morphological Study; Analytical-chemical study; CO2レーザー; 微小引張試験; 接着耐久性; 微細構造; 接着強さ

This study was to investigate 1) the changes of surface characteristics of Er : YAG or CO2 lased dentin and 2) the adhesive properties of resinous materials to the lased dentin. From Scanning Electron Microscopic (SEM) and Atomic Force Microscopic (AFM) study, the smear layer could not be detected on the lased dentin surface, and the structural defects such as micro cracks and stratiform structure were formed. Thermographic analysis exhibited that the laser irradiation generated high heat of temperature value of above 200 ℃. The analysis of lased dentin using Energy Dispersive X-ray Spectroscopy, Electron Probe X-ray Microanalyser, and Nano-indentation Tester revealed the decrease in hardness and in concentration of Ca and P in the superficial layer of approximately 30 μm thickness. According to these changes heat-denatured layer and a layer with destroyed dentinal collagen fibers were observed under Light Microscopy (LM), Transmission Electron Microscopy (TEM) and X-ray photoelectron Spectroscopy.Early bond strength and durability of adhesion of the commercial adhesives to the lased dentin were significantly lower than those to the rotary cut dentin in micro-tensile bond test. This might be caused by the concentration of stress to those structural defects, by the inhibition of resin-impregnation due to the denatured layer, or by the deterioration of mechanical properties of the hybrid layer and the lased dentin itself. In order to adapt commercial adhesives to lased dentin, pretreatments for the removal of defects and denatured layer were examined. LM, SEM and TEM study revealed that they could be removed with 30 seconds' phosphoric acid etching followed by 60 seconds' (Er : YAG) or 120 seconds' (CO2) sodium hypochlorite treatment. This pretreatment could regain adhesive properties of commercial bond systems equally to those to rotary cut dentin.

本研究旨在探讨Er：YAG和CO2激光对牙本质表面特性的影响，以及树脂材料对激光牙本质的粘接性能。扫描电子显微镜(SEM)和原子力显微镜(AFM)观察表明，激光处理后牙本质表面没有明显的涂抹层，形成微裂纹、层状结构等结构缺陷。热像分析表明，激光辐照产生了高于2 0 0℃的高热。用能量色散X射线光谱仪、电子探针X射线显微分析仪和纳米压痕测试仪对激光处理后的牙本质进行了分析，结果表明，在约30μm厚度的表层，激光处理后牙本质的硬度和钙磷浓度均有所降低。根据这些变化，在光镜、透射电子显微镜和X射线光电子能谱下观察到热变性层和牙本质胶原纤维破坏层。微拉伸粘接试验表明，商品粘结剂与激光牙本质的早期粘接强度和粘接耐久性明显低于旋转切割牙本质。这可能是由于应力集中在这些结构缺陷上，由于变性层抑制了树脂的浸渍，或者是由于混合层和激光牙本质本身的机械性能恶化所致。为了使商用粘结剂适应激光牙本质，对去除缺损层和变性层的前处理进行了研究。光镜、扫描电子显微镜和透射电子显微镜研究表明，用30秒的磷酸酸蚀和60秒的(Er：YAG)或120秒(CO2)的次氯酸钠处理可以去除它们。这种前处理可以恢复商业粘结系统的粘接性能，与旋转切割牙本质的粘接性能相同。

项目成果

冨士谷盛興: "Er:YAGレーザーの歯科臨床への応用"広島歯科医学雑誌. 26. 56-58 (1998)

藤谷盛树：“Er:YAG 激光在临床牙科中的应用”广岛牙科杂志 26. 56-58 (1998)。

Takahiro Harima: "Adhesive properties of resinous materials to lased dentin. Part 4 Durability of resin bonds to lased dentin"The Japanese Journal of Conservative Dentistry. 42(Autumn issue). 34 (1999)

Takahiro Harima：“树脂材料与激光牙本质的粘合性能。第 4 部分树脂与激光牙本质结合的耐久性”日本保守牙科杂志。

播磨貴裕, 冨士谷盛興, 他: "レーザー処理象牙質表層の構造変化とレジンの接着"広島大学歯学雑誌. 31・2. 186 (1999)

Takahiro Harima、Morioki Fujitani 等：“激光处理的牙本质表面层的结构变化和树脂粘附”广岛大学牙科杂志 31・2（1999 年）。

播磨貴裕: "レーザー処理象牙質におけるレジンの接着 第2報 レーザーによる熱の影響について"日本歯科保存学雑誌. 41. 70 (1998)

Takahiro Harima：“激光处理牙本质上的树脂粘附第 2 部分：激光热的影响”日本保守牙科杂志 41. 70 (1998)。

播磨貴裕: "レーザー処理象牙質におけるレジンの接着 第5報 接着界面の超微細構造について"日本歯科保存学雑誌. 44. (2001)

Takahiro Harima：“激光处理牙本质上的树脂粘附力第 5 部分：粘附界面的超精细结构”日本保守牙科杂志 44。（2001 年）